Pressure-gage.



No. 7o|,793`. 'Pafentedlune 3,1902. E. c. BATES.

(Ilo Model.)

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UNITED STATES PATENT OFFICE.

EDWARD CARRINGTON BATES, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO CROSBY STEAM GAGE da VALVE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

PRESSURE-GAGE.

SPECIFICATIONYformng part of Letters Patent No. 701,793, dated June 8, 1902.

Application led July 8,1899. Serial N0. 72`3,202. (N0 model.)

To all whom it may concern:

Be it known that L'EDwARD OAEEINGTON BATES, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Pressure- Gages, of which the following is a speciiication.

This invention relates to an improvement in pressure-gages provided with aBonrdon tube-spring, and moreparticularly to the wa- 1o ter-chamber employed in combinationwith such spring, being in the main an improvement on the device described in Letters Patent No. 596,674. Y

The object of the invention is .to provide I5 means for easily and eifectively lling the springs withwater or other liquid and keeping the water or other` liquid in the springs. It is necessary to keep the springs filled with water to prevent their u ndue heating and conzo sequent errors, as'more fully` explained in the Letters Patent. above referred to. Y

Another feature of the invention is the attachment of the springs directly to the waterchamber, which arrangement is made practicable by the employment of tube C. This tube C is employed to conduct the steam from the boiler and discharge it into the waterchamber at a point above the level of the water in said chamber. Preferably the tube C 3o extends to the upper part of the chamber, and the water in saidchamber is kept at a high level, thus reducingY the space into which the steam -is'discharged and in whichit is contained and practically surrounding this space,

`3 5 as well as the tube C itself, with water, so that the danger of overheating the gage and its parts is reduced to a minimum. Being so located, the tube C permits thelargest body of water to remain inv the water-chamber and 4o prevents its flowing therefrom when the steam is shut 0E. It is essential that there should be a body of water always interposed between the steam-pipe of the gage and the Bourdon springs thereof to protect them.

The invention is illustrated by the accompanying drawings, which form a part of this specification, and in which similar letters refer to similar parts throughout.

Figure l represents a gagehaving the glass 5o face, dial, and index` broken away to show the interior mechanism of the gage. Fig. 2 is a vertical section` through the diameter of the gage.

A is the gage-case.

B is the water-chamber attached to the gage= case by the screws b b', furnished with screwthreaded openings h2 b2 to receive the cylindrical screw-threaded ends d d of the Bourdon tube-springs D D, furnished also with the screw-threaded opening b'to receive and engage the washer c and a 'pipe (not shown) adapted to attach the gage tothe boiler and to admit of the passageof the tube C. The water-chamber is furnished also with a passage b5, leading to the open air and closed by a screw h4. v

D D are Bourdon tube-springs having the' cylindrical screw-threaded ends d d and the cylindrical screw-,threaded ends d2 d2 to receive and engage the screw-threaded plugs d3 d3, to which is'fastened the registering mechanism E by the pivotal screws d d. The tube C is furnished with the flange c and leads from the opening b to the top of the waterchamber. g 7 5 c is a screw-threaded washer adapted to hold the flange c against the upper part of the opening b. A i

The water-chamber and springs are filled with water by inverting the gage and pouring thewater through the passage b into the chamber and thence into the spring,the'screw b4 beingfrst removed to provide for the escape of air through thel passage b3. A

Having described my invention, what I claim is- In a'pressure-gage the combination of a Bourdon tube-sprin g with an elongated water-chamber entirely within the curve of the spring; said water-chamber vhaving located within it a tube isolated from the lateral walls; the upper' end of vsaid tube communicating with the upper portion of said` chamber, and the vlower end of said tube being lconnected with the steam-passage of the gage; substantially as described.

In testimony whereof l have affixed my signature in presence of two witnesses.

EDWARD GARRINGTON BATES.

Witnesses:

WATERMAN L. WILLIAMS, CEAS. M. REED. 

